Ten years in, you stop keeping score. The mortgage comes out of one account, the groceries out of another. Her name is on the car; the house is in his. You've weathered a layoff, a health scare, two dogs, and a kitchen renovation that nearly ended everything. By any human measure, you are family.
By legal measure, you are roommates.
This is the fact at the center of estate planning for unmarried couples, and almost no one says it this plainly: in every U.S. state, the default rules that decide who inherits, who makes medical decisions, and who even gets information at the hospital were written for spouses and blood relatives. A partner of ten years — or thirty — appears nowhere in them. Marriage is not just a relationship status. It is a legal bundle of several hundred automatic rights, and if you haven't signed the license, you haven't received the bundle. Everything a spouse gets by default, an unmarried partner must build by hand.
The estate plan your state wrote assumes you're married
When someone dies without a will, state intestacy law distributes their property according to a fixed hierarchy: spouse first, then children, then parents, then siblings, then increasingly distant relatives. It is a reasonable guess at what most people would want — for most people in 1950.
An unmarried partner is not on the list. Not far down the list; not on it. If your partner dies without a will, the house titled in their name goes to their parents or siblings, and you may be, in the eyes of the probate court, a tenant in someone else's inheritance. This isn't a rare edge case or a hostile judge. It is the statute working exactly as written, applied to a household the statute never imagined.
The same logic runs through the rest of the system. Retirement accounts pass to named beneficiaries — and if no one is named, they typically fall to the estate and back into that same hierarchy. In many states, the law that decides who directs a funeral and receives the remains points to next of kin. A partner can find themselves excluded from decisions about the person they knew best, by people who knew the deceased least.
The seven-year myth
Many couples believe that after enough time together, the law quietly upgrades them — the folk notion that seven years of cohabitation creates a common law marriage. It doesn't, anywhere. No state confers marriage by duration alone.
Common law marriage does still exist, but only a small minority of states — fewer than a dozen — recognize new ones, and even there it requires more than living together: generally you must intend to be married and hold yourselves out publicly as spouses. Filing taxes as single, introducing each other as partners rather than husband or wife, keeping separate names on the lease — all of that is evidence against a common law marriage, not toward one. Couples who deliberately chose not to marry almost never meet the test, which is fitting in a bleak way: the law takes them at their word.
Why careful people still assume they're covered
The gap persists not because people are careless but because two well-documented cognitive patterns hide it.
The first is what psychologist Neil Weinstein called unrealistic optimism: people systematically rate their own risk of bad outcomes as lower than other people's, especially for events that feel distant and uncontrollable. An early death is the textbook case. The scenario in which these rules matter is precisely the one our risk perception is worst at taking seriously.
The second is the pull of defaults. Behavioral economists William Samuelson and Richard Zeckhauser named the pattern status quo bias: across domains, people disproportionately stick with whatever arrangement requires no action. Later research on defaults — most famously Eric Johnson and Daniel Goldstein's work on organ donation enrollment — showed how powerfully the preset option shapes outcomes, in part because a default reads as a recommendation. If the state has a default plan for what happens when I die, the intuition goes, it must be roughly sensible. For unmarried couples, that implicit endorsement is exactly backwards. The default was never designed for you. Doing nothing doesn't mean accepting a reasonable standard arrangement; it means accepting an arrangement built for a family structure you deliberately don't have.
Where the gap actually bites
It helps to walk the timeline, because the will is only one piece of it.
At the hospital, medical privacy law limits who receives information, and if you can't speak for yourself, most states fall back on a surrogate hierarchy that mirrors intestacy: spouse, adult children, parents, siblings. Some states include a domestic partner or close friend somewhere in the sequence; many effectively don't. Your partner can be the person who knows your wishes best and still be legally outranked by a parent you haven't spoken to in years.
At the bank, accounts in one name freeze at death until the estate is opened. If the household bills flow through the deceased partner's checking account, the surviving partner may spend months without access to money they always thought of as shared.
At home, everything turns on the deed. A house owned as joint tenants with right of survivorship passes automatically to the survivor. A house in one partner's name alone passes through their estate — to their heirs, who now own the roof over the survivor's head.
And there is a quieter risk running under all of it: family. A spouse has standing that relatives can't easily challenge. A partner's standing exists only on paper — so if the paper doesn't exist, grief-stricken or disapproving relatives don't have to fight you in court. They simply inherit, and you're the one who has to sue.
The short list that replaces the bundle
The repair is unglamorous and very doable. For most unmarried couples it comes down to six documents and one afternoon of titling review: a will (or living trust) naming your partner; beneficiary designations on every retirement account and life insurance policy, checked against what you think they say; a healthcare proxy naming your partner as medical decision-maker; a HIPAA release so they can receive information even when they're not deciding; a durable financial power of attorney for incapacity; and a review of how the house and major accounts are titled, since survivorship titling and transfer-on-death designations pass property outside probate entirely. Couples with meaningfully mixed finances may add a cohabitation agreement — a plain contract recording who owns what.
None of this is exotic. It is the married-couple bundle, reassembled by hand. The work isn't hard; it's remembering that it was never done for you.
The map that keeps the list honest
Here's the catch with a hand-built bundle: unlike marriage, it doesn't maintain itself. A spouse's rights follow them through a move to a new state, a job change, a refinance. Your documents don't. The 401(k) from the new employer starts with no beneficiary. The refinanced house comes back titled differently. The healthcare proxy is in a drawer in an apartment you left two addresses ago. Estate planning for unmarried couples isn't one project — it's an inventory that has to stay current, because every piece that drifts silently reverts to defaults that were never yours. That's the problem Heirloom was built for: one living map of what you own, how it's titled, who's named on it, and where the documents actually live, with the gaps made visible before they matter instead of after. If you've built your family by choice rather than by license, you deserve to see, in one place, whether the paperwork agrees. You can start your map at heirloom.lumenlabs.works.